if_bridge and CARP causes hangs

[Stefan Bethke]

I’ve just stumbled on this problem, which seems to be quite old and still unresolved.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200319

As a quick summary: if you configure CARP on an if_bridge interface, the CARP state changes will (always/with a high probability) create a deadlock between CARP and the if_bridge code, leading to the machine becoming unresponsive.

There is a suggested patch, but work on it seems to be very slow:
https://reviews.freebsd.org/D3133

I would love to see a fix in 11-stable or 12.0. Is there something I can do to help move this forward?


Regards,
Stefan

--
Stefan Bethke <stb at lassitu.de>   Fon +49 151 14070811

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